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Business Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Mar. 29, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Processing and services revenue										$ 4,975	$ 4,833	$ 4,625
Product revenue										848	863	880
Total revenue		$ 1,551	$ 1,412	$ 1,420	$ 1,440	$ 1,516	$ 1,400	$ 1,386	$ 1,394	5,823	5,696	5,505
Operating income		431	356	358	608	425	370	372	365	1,753	1,532	1,445
Total assets		11,262				10,289				11,262	10,289	9,743
Capital expenditures										360	287	290
Depreciation and amortization expense										556	444	421
Gain on sale of businesses		0	$ (2)	$ (3)	$ 232	0	$ 0	$ 10	$ 0	227	10	0
Operating segments | Payments
Segment Reporting Information [Line Items]
Processing and services revenue										2,728	2,476	2,334
Product revenue										739	758	756
Total revenue										3,467	3,234	3,090
Operating income										1,122	1,034	943
Total assets		7,622				6,596				7,622	6,596	6,143
Capital expenditures										239	182	161
Depreciation and amortization expense										225	169	141
Operating segments | Financial
Segment Reporting Information [Line Items]
Processing and services revenue										2,204	2,347	2,285
Product revenue										191	183	192
Total revenue										2,395	2,530	2,477
Operating income										798	849	823
Total assets		3,240				3,309				3,240	3,309	3,287
Capital expenditures										115	95	125
Depreciation and amortization expense										145	92	96
Corporate and Other
Segment Reporting Information [Line Items]
Processing and services revenue										43	10	6
Product revenue										(82)	(78)	(68)
Total revenue										(39)	(68)	(62)
Operating income										(167)	(351)	(321)
Total assets		$ 400				384				400	384	313
Capital expenditures										6	10	4
Depreciation and amortization expense										$ 186	183	$ 184
Corporate and Other | Discontinued Operations, Held-for-sale
Segment Reporting Information [Line Items]
Total assets						$ 50					$ 50
Lending Solutions Business | Corporate and Other
Segment Reporting Information [Line Items]
Gain on sale of businesses	$ 227
Fiserv Automotive Solutions, LLC | Financial
Segment Reporting Information [Line Items]
Controlling interest sold	55.00%

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